Won't there be a noticeable gap in the wheel well with that size because with a 295/45/20 you have 5.23" of sidewall and its a total height of 30.45". With the 315/35/20 the sidewall is 4.34" and total height is 28.68" making a difference of 1.77" from stock height to the shorter 315/35/20 tire.
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